Zygodactylic
Zygodactylic , adjective
[Greek zygo`n a yoke, pair + {not transcribed} finger, toe: compare French zygodactyle.]
(Zoology) Yoke-footed; having the toes disposed in pairs; -- applied to birds which have two toes before and two behind, as the parrot, cuckoo, woodpecker, etc.
Also: Zygodactylous